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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../error_category.html below:

std::error_category - cppreference.com

C++ Compiler support Freestanding and hosted Language Standard library Standard library headers Named requirements Feature test macros (C++20) Language support library Concepts library (C++20) Diagnostics library Memory management library Metaprogramming library (C++11) General utilities library Containers library Iterators library Ranges library (C++20) Algorithms library Strings library Text processing library Numerics library Date and time library Input/output library Filesystem library (C++17) Concurrency support library (C++11) Execution control library (C++26) Technical specifications Symbols index External libraries [edit] Utilities library Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Program utilities Variadic functions initializer_list

(C++11)

is_constant_evaluated

(C++20)

is_within_lifetime

(C++26)

source_location

(C++20)

Coroutine support (C++20) Contract support (C++26) Three-way comparison three_way_comparablethree_way_comparable_with

(C++20)(C++20)

strong_ordering

(C++20)

weak_ordering

(C++20)

partial_ordering

(C++20)

common_comparison_category

(C++20)

compare_three_way_result

(C++20)

compare_three_way

(C++20)

(C++20)

(C++20)

partial_order

(C++20)

compare_strong_order_fallback

(C++20)

compare_weak_order_fallback

(C++20)

compare_partial_order_fallback

(C++20)

is_eqis_ltis_lteq

(C++20)(C++20)(C++20)

is_neqis_gtis_gteq

(C++20)(C++20)(C++20)

General utilities Function objects Bit manipulation (C++20) C-style bit manipulation (C++26) bitset hash

(C++11)

Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator> rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than

(C++20)(C++20)(C++20)

cmp_not_equalcmp_greatercmp_greater_than

(C++20)(C++20)(C++20)

(C++20)

Swap and type operations swap ranges::swap

(C++20)

(C++14)

(C++11)

to_underlying

(C++23)

(C++11)

(C++23)

(C++11)

move_if_noexcept

(C++11)

(C++17)

Common vocabulary types pair tuple

(C++11)

(C++17)

any

(C++17)

(C++17)

(C++11)

tuple_element

(C++11)

(C++17)

make_from_tuple

(C++17)

(C++23)

[edit] Diagnostics library Exception handling exception uncaught_exceptionuncaught_exceptions

(until C++20*) (C++17)

exception_ptr

(C++11)

make_exception_ptr

(C++11)

current_exception

(C++11)

rethrow_exception

(C++11)

nested_exception

(C++11)

throw_with_nested

(C++11)

rethrow_if_nested

(C++11)

Exception handling failures terminate terminate_handler get_terminate

(C++11)

set_terminate bad_exception unexpected

(until C++17*)

unexpected_handler

(until C++17*)

get_unexpected

(until C++17*)

set_unexpected

(until C++17*)

Error numbers Error codes errno Assertions assert Exception categories logic_error invalid_argument domain_error length_error out_of_range runtime_error range_error overflow_error underflow_error tx_exception

(TM TS)

error_category

(C++11)

generic_category

(C++11)

system_category

(C++11)

error_condition

(C++11)

(C++11)

(C++11)

(C++11)

Stacktrace stacktrace_entry

(C++23)

basic_stacktrace

(C++23)

Debugging support is_debugger_present

(C++26)

breakpoint_if_debugging

(C++26)

(C++26)

[edit] std::error_category Member functions error_category::error_category error_category::~error_category error_category::name error_category::default_error_condition error_category::equivalent error_category::message error_category::operator==error_category::operator!=error_category::operator<error_category::operator<=>

(until C++20)(until C++20)(C++20)

[edit]

Defined in header

<system_error>

class error_category;

(since C++11)

std::error_category serves as the base class for specific error category types, such as std::system_category, std::iostream_category, etc. Each specific category class defines the error_code - error_condition mapping and holds the explanatory strings for all error_conditions. The objects of error category classes are treated as singletons, passed by reference.

[edit] Member functions (constructor) constructs an error_category
(public member function) [edit] (destructor)

[virtual]

destructs an error_category
(virtual public member function) [edit]

operator=

[deleted]

not copy assignable
(public member function) [edit] name

[virtual]

obtains the name of the category
(virtual public member function) [edit] default_error_condition

[virtual]

maps error_code to error_condition
(virtual public member function) [edit] equivalent

[virtual]

compares error_code and error_condition for equivalence
(virtual public member function) [edit] message

[virtual]

obtains the explanatory string
(virtual public member function) [edit] operator==operator!=operator<operator<=>

(removed in C++20)(removed in C++20)(C++20)

compares two error categories
(function) [edit] [edit] Specific error categories generic_category

(C++11)

identifies the generic error category
(function) [edit] system_category

(C++11)

identifies the operating system error category
(function) [edit] iostream_category

(C++11)

identifies the iostream error category
(function) [edit] future_category

(C++11)

identifies the future error category
(function) [edit] [edit] See also error_condition

(C++11)

holds a portable error code
(class) [edit] error_code

(C++11)

holds a platform-dependent error code
(class) [edit]

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